You will get your download code for the Mewtwo DLC for the Nintendo Wii U game "Super Smash Bros Mewtwo" by Nintendo within minutes by eMail. Using this code, you can download the game in the Nintendo eShop.

To do so, choose the Nintendo eShop in the Home menu of your Wii U, click on "menu", "Settings and more", then "Wii Download Ticket". Here you can enter your code, then click on "okay" and "redeem" and the download begins.